# Construction Covers (DD-631)

> In crowded Chinese cities, some building and excavation sites are now covered by huge air-supported domes, sometimes called 'soft pillows' or 'giant airbags'. Fans on the ground keep pumping air in, so the slightly higher pressure inside holds up a membrane, often PVDF-coated fabric, usually reinforced with steel cables. The main goal is to keep dust and noise from reaching the neighbors. Local officials say a nearly 9,000 m² dome over a renovation site in Guangzhou's Yuexiu District blocks up to 99% of dust. CGTN reported that it keeps construction noise below 60 decibels. A dome in Shenzhen stands 40 m tall over more than 12,000 m². Officials say such domes can be reused and taken down without leaving construction waste. A related design is used on contaminated land. In 2016, a soil-cleanup project at Beijing's former Shougang steelworks built what researchers called China's first negative-pressure membrane yard. There the air pressure is kept slightly lower inside, so fumes and dust can't leak out, and exhaust is filtered before release. The footage shows a white dome between towers and a Gothic-style church, but the Reel doesn't name the site.

- Department: Tech (also Locations)
- First published: 2025-08-04
- Last updated: 2025-08-04
- Permalink: https://detailenjoyer.com/case/construction-covers/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **2016**: Beijing's Shougang soil cleanup builds what researchers called China's first negative-pressure membrane yard

Full timeline: https://detailenjoyer.com/timeline/?case=construction-covers

## Quick facts

- **DD-631-F01**: Fans keep air-supported construction domes inflated. _(Write-up · Exhibit A (Held up by air))_
- **DD-631-F02**: A Guangzhou dome is reported to block up to 99% of dust. _(Write-up · Exhibit B (For the neighbors))_

## Write-up

A building site under a bubble. Air-supported domes keep dust and noise in.

1. **Held up by air**: Ground fans keep the inside pressure slightly higher than outside, which holds up a PVDF membrane over the site.
2. **For the neighbors**: A Guangzhou dome is reported to block up to 99% of dust, and CGTN says it keeps noise below 60 decibels.
3. **Big ones**: A Shenzhen dome stands 40 m tall and covers more than 12,000 m².
4. **Reusable**: Officials describe the domes as reusable and easy to take down, with no construction waste.
5. **Negative pressure**: For contaminated soil, a 2016 Beijing yard kept the air pressure lower inside so fumes couldn't escape.

## Related case files

- [Counter Crane (DD-687)](https://detailenjoyer.com/case/counter-crane/): Another case about construction-site safety
- [CIPP (DD-676)](https://detailenjoyer.com/case/cipp/): Another low-disruption way to build in a city

## Reel vs. record

- **Main purpose**: the domes are mostly about protecting the neighborhood, keeping dust and noise in, more than protecting the project from the weather.
- **Note**: 'Inflatable': they aren't sealed balloons. Fans run continuously to keep the inside air pressure slightly higher than outside. Membranes are often PVDF-coated fabric, usually with steel cables.
- **Note**: 'Cost savings compared to scaffolding': I found no cost comparison. A dome covers a whole site, while scaffolding does a different job, so the Reel's comparison is unsupported.
- **Note**: 'Quickly deployed and moved': officials describe the domes as reusable and easy to take down, but these are large engineered structures, not quick pop-ups.
- **Missing**: on contaminated land, some domes are kept at lower pressure inside so polluted air can't leak out, with exhaust filtered first (as at a 2016 Beijing soil-cleanup site).

## Video: Construction Covers: A Building Site Under a Bubble

- Duration: 20.7 s · Published: 2025-08-04
- File: https://detailenjoyer.com/assets/videos/DM9VerhM9vp.mp4

### Transcript

DID YOU KNOW? Chinese inflatable construction site covers are large, air-supported structures used to protect construction projects from weather and dust, while providing a controlled environment for workers. Made from durable weather resistant materials, these inflatable covers can be quickly deployed and moved, offering flexibility and cost savings compared to traditional scaffolding or hard enclosures. NOW YOU KNOW!

## Questions & answers

**Q: What holds up an air-supported construction dome?**  
A: Fans keep the inside pressure slightly higher. _(Source: Write-up · Exhibit A (Held up by air) · Shenzhen Government Online: Giant 'soft pillows' reshape construction in Guangzhou and Shenzhen; CGTN (Mar 13, 2026): 9,000 m² 'giant airbag' installed at construction site in S. China)_

**Q: What is the main reason for these domes in Chinese cities?**  
A: They contain dust and noise. _(Source: Write-up · Exhibit B (For the neighbors) · Shenzhen Government Online: Giant 'soft pillows' reshape construction in Guangzhou and Shenzhen; CGTN (Mar 13, 2026): 9,000 m² 'giant airbag' installed at construction site in S. China)_

**Q: How much dust is a Guangzhou dome reported to block?**  
A: Up to 99%, according to local officials. _(Source: Write-up · Exhibit B (For the neighbors) · Shenzhen Government Online: Giant 'soft pillows' reshape construction in Guangzhou and Shenzhen; CGTN (Mar 13, 2026): 9,000 m² 'giant airbag' installed at construction site in S. China)_

**Q: How tall is the Shenzhen dome?**  
A: 40 m tall, over more than 12,000 m². _(Source: Write-up · Exhibit C (Big ones) · Shenzhen Government Online: Giant 'soft pillows' reshape construction in Guangzhou and Shenzhen)_

**Q: Why keep a contaminated-soil dome at lower pressure inside?**  
A: Air flows in, not out. _(Source: Write-up · Exhibit E (Negative pressure) · Application of technology of negative pressure membrane structure for soil remediation (2018), Advances in Environmental Protection)_

## Sources

- [Shenzhen Government Online: Giant 'soft pillows' reshape construction in Guangzhou and Shenzhen](https://www.sz.gov.cn/en_szgov/news/latest/content/post_12743452.html)
- [CGTN (Mar 13, 2026): 9,000 m² 'giant airbag' installed at construction site in S. China](https://news.cgtn.com/news/2026-03-13/9-000-m-giant-airbag-installed-at-construction-site-in-S-China-1LttOnwUtK8/p.html)
- [Application of technology of negative pressure membrane structure for soil remediation (2018), Advances in Environmental Protection](https://pdf.hanspub.org/aep20180200000_37887520.pdf)

## Cite this case file

Easterling, Marcus. "Construction Covers." The Detail Department (DetailEnjoyer), case file DD-631, last updated Aug 4, 2025. https://detailenjoyer.com/case/construction-covers/